debian-packages/taggedalgebraic
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Work around Phobos issue 19696.

Browse source
This commit is contained in:
Sönke Ludwig 2019-02-23 17:19:00 +01:00
parent 6589bac23a
commit 56d50fd56c
1 changed files with 22 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
source/taggedalgebraic/taggedunion.d
View file

@ -378,6 +378,22 @@ unittest { // test for name clashes
assert(tu.stringValue == "foo");
}
unittest { // test woraround for Phobos issue 19696
struct T {
struct F { int num; }
alias Payload = TaggedUnion!F;
Payload payload;
alias payload this;
}
struct U {
T t;
}
alias TU = TaggedUnion!U;
static assert(is(TU.FieldTypes[0] == T));
}
/** Dispatches the value contained on a `TaggedUnion` to a set of visitors.
@ -620,7 +636,12 @@ template TypeOf(alias kind)
// NOTE: ReplaceType has issues with certain types, such as a class
// declaration like this: class C : D!C {}
// For this reason, we test first if it compiles and only then use it.
static if (is(ReplaceType!(This, U, FT)))
// It also replaces a type with the contained "alias this" type under
// certain conditions, so we make a second check to see heuristically
// if This is actually present in FT
//
// Phobos issues: 19696, 19697
static if (is(ReplaceType!(This, U, FT)) && !is(ReplaceType!(This, void, FT)))
alias TypeOf = ReplaceType!(This, U, FT);
else alias TypeOf = FT;
}